The first Neanderthal skeleton recognized as such was found in a limestone quarry in the Neander Valley in Germany in 1856. At first, this rather odd skeleton was thought to be that of some medieval guy crippled by arthritis (or a Celt, or a diseased Cossack): it was only identified as a representative of an extinct type of human somewhat later. This other human race was named after the site: spelling reform later changed its name to Neandertal and eventually most paleontologists followed, driven by obscure interdepartmental struggles. We’re sticking with ‘Neanderthal’, though: an archaic spelling seems only appropriate for a vanished species.

We know quite a bit about the Neanderthals, more in fact than we know about our anatomically modern African ancestors of that period. In part this is because physical conditions in Western Europe favored preservation so that there really are more fossil remains. In addition, a high level of general education meant that farmers and quarrymen were more likely to call in a professor when they found cave paintings or an odd-looking skeleton: that is, more likely in nineteenth-century Germany or France than in nineteenth-century Africa or China. There were plenty of professors close by, since Neanderthals left their remains conveniently close to famous universities and five-star restaurants. Many Neanderthal skeletons, site, and artifacts have been found – remains from a few hundred individuals, in sharp contrast to the handful of known African human fossils from the same period.

The Neanderthals had big brains (averaging about 1500 cubic centimeters, noticeably larger than those of modern people) and a technology like that of their anatomically modern contemporaries in Africa, but were quite different in a number of ways: different physically, but also socially and ecologically. Neanderthals were cold-adapted, with relatively short arms and legs in order to reduce heat loss - something like Arctic peoples today, only much more so. Considering that the climate the Neanderthals experienced was considerably milder than the high Arctic (more like Wisconsin), their pronounced cold adaptation suggest that they may have relied more on physical than cultural changes. Of course they spent at least six times as many generations in the cold as any modern human population has, and that may have had something to do with it as well.

We don’t yet know for sure, but it seems likely that, as part of their adaptation to cold, Neanderthals were furry. Chimpanzees have ridges on their finger bones that stem from the way that they clutch their mother’s fur as infants. Modern humans don’t have these ridges, but Neanderthals do. Moreover, we know that humans can become furry with very simple genetic changes, since there are a few people working in the circus in which such a change has already taken place.

They were chinless and had big honking noses, heavy brow ridges, a pulled-forward face, and long, low skulls that tended to bulge outwards at the sides. The body form differences are seen in children – and so they were innate, rather being a consequence of their way of life. They were heavily built and muscular, judging from their skeletons, which had larger areas of muscle attachment than those seen in people today or in their contemporary African cousins. This means that they were stronger than us, probably much stronger. You could think of them as being born wrestlers.

Those conclusions about Neanderthal physique come from studying fossils, but modern methods have allowed researchers to draw less obvious conclusions as well. ...

Judging from the isotopic composition of their remains, Neanderthals were meat-eaters, pure top carnivores, comparable to lions or wolves. This is very different from most contemporary hunter-gatherers, who usually depend more on plant foods than meat.

It also seems that they ate almost no fish, which is somewhat surprising, considering that a number of the Neanderthal sites have been along rivers with strong salmon runs.

Like other top carnivores, Neanderthals were thin on the ground. The typical Neanderthal site has relatively more remains of cave bears than later sites occupied by modern humans, which suggests that Neanderthals were scarcer than later humans. We think that there may have been as few as 30,000 of them in all of Europe.

Neanderthal sites are generally found in caves and beneath rock overhangs, which functioned as shelters and also tended to preserve their remains. We have found signs of open-air camps as well, but any structures built seem to have been very simple. Such camps may have been common, but were far less likely to be preserved than sites in caves and rock shelters: as so often in archaeology, differences in preservation can completely obscure the original distribution of things.

Neanderthals used rather sophisticated stone tools, but used almost no bone, ivory, or shell. They had fewer types of tools than their successors. Their “Mousterian” tools (named for the southwestern French site Le Moustier), consisted of carefully shaped flake tools and small hand axes, almost always made from local materials. We find Mousterian tools over vast areas of Europe and western Asia, but there is little variation in space or time, which supports the general impression that their capacity to innovate was low. François Bordes, a famous French archaeologist, has said their technology consisted of “beautiful tools made stupidly” - by rote, or perhaps by instinct.

There are indications that they often used those stone tools to make things out of wood, but only a few such wooden objects have been preserved. We find awls that could pierce animal hides, but no bone needles with eyes, which their successors used to make tailored clothing. There is evidence that they processed hides, presumably for clothing, but they must have been used for blankets or ponchos rather than coats or parkas. That kind of clothing was good enough to let them survive in Ice Age Europe, but evidently not good enough to allow the Neanderthals to settle the high Arctic: ultimately this also kept them out of the Americas. Their front teeth show an unusual pattern of wear – apparently they were used as a third hand or vice, or perhaps to prepare animal skins. Somewhat similar patterns of wear have been observed in peoples like Eskimos that prepare hides by chewing.

Neanderthals had fire, and probably could not have settled ice-age Europe without it. However, they didn’t do anything fancy with it: there were no specialized hearths and there is no evidence that they used lamps.

Neanderthals are the first humans known to have buried their dead, but there is no clear evidence of ceremony or ritual in those burials. We don’t find weapons or decorative objects associated with those graves as we often do with the graves of modern humans. It may be that burial was for them more a way of disposing of unpleasant remains than a ritual occasion. It may have been more like flushing a goldfish down the toilet.

We know that Neanderthals hunted big game (red deer, European bison, sometimes mammoths and rhinos) and took big risks in the process, judging from their many healed fractures. The injury pattern is like that of bronco riders, as documented by Eric Trinkaus. At root, these high risks were a consequence of their lack of projectile weapons, which allow hunters to bring down big game without getting dangerously close – that and a lack of any other safe way of making a living. Neanderthals used stabbing spears and were probably ambush hunters. Using this strategy, they had to get up close and personal with desperate animals that outweighed them several fold, a good way to get hurt.

Since they were so often injured, they had to help each other. That's the only way in which they could have survived while recovering from those serious injuries. You see a similar pattern in some other cooperative-hunting species such as lions: injured members of the pride manage to feed off the kills of others while they recover. We see lots of healed injuries in saber-tooth tigers as well, whose hunting pattern of stabbing from ambush was rather similar to that of Neanderthals. Come to think of it, their heavy, almost bear-like build (compared to that of the other big cats) was also similar. In some cases, Neanderthals carried this cooperation very far, providing care that allowed permanently crippled individuals to reach advanced ages. The most famous example of this is the skeleton of a forty-something man found in Shanidar, in northern Iraq. His right arm was withered and had suffered multiple fractures, while the lower arm and hand had been lost. He had a crippled and withered right leg. In addition, he had suffered a crushing blow to the face that likely left him blind in one eye. All of these were long-healed injuries. Clearly, this guy had been around the block – twice, on his face.

Groups of Neanderthals were able to kill big game, but that would have been far harder for individuals. As a member of the group, they also received the Paleolithic equivalent of health insurance, a necessity in their kind of high-risk hunting. Because of group efficiency in hunting and the high degree of within-group cooperation, membership in a Neanderthal band or tribe was valuable. It would have been almost impossible to survive outside such a group. As Bill Hamilton has said, such arrangements are vulnerable to free-riders, individuals that take advantage of the benefits but don’t pull their weight – which in this case would have meant avoiding hunting and its risks. A high degree of within-band relatedness would have mitigated this tendency – due to kin selection, the principle that behaviors that cost the individual but help close relatives can be favored by selection. This suggests that Neanderthal bands may have been reluctant to accept outsiders, especially males, if we assume that males had the primary responsibility for hunting. Unrelated newbies would have had the most to gain by shirking dangerous duties.

Hamilton pointed out that, among social carnivores, the would-be immigrant often has to go through a difficult probationary period without necessarily succeeding – we see a similar pattern in some recent hunter-gatherers. There would have to have been a way in which new individuals could join the tribe, in order to avoid dangerous levels of inbreeding. It may be that only females changed bands, which is apparently the case in chimpanzees and is the most common pattern in humans.

Trends of this sort may have existed in anatomically modern humans as well, but the high risks associated with Neanderthals’ specialized big-game hunting may have taken things much further. We expect that they were more cooperative than our African ancestors and more clannish. This might have interfered with inter-band relations and made the development of trade and other inter-band social interactions more difficult.

` If you take too many chances in the process of making a living, you'll get yourself killed before you manage to raise a family. Therefore there is a maximum sustainable risk per calorie acquired from hunting. If the average member of the species incurs too much risk, more than that sustainable maximum, the species goes extinct. The Neanderthals must have come closer to that red line than anatomically modern humans in Africa. Risks were particularly high because the Neanderthals seem to have had no way of storing food – they had no drying racks or storage pits in frozen ground like those used by their successors. Think of it this way: storage allow more complete usage of a large carcass such as bison that might weigh over a thousand pounds – it wouldn’t be easy to eat all of that before it went bad. Higher utilization - using all of the buffalo - drops the risk per calorie.

Since women in Africa were probably gathering vegetable foods, men there didn't have to produce as much food or produce it as steadily, which meant that they could choose game animals that were safer but less abundant. And that's what they did in Africa's Middle Stone Age (MSA). They went after relatively uncommon but mild-mannered eland, rather than abundant, deadly dangerous Cape buffalo. And as corollary, anatomically modern humans in Africa didn't have as heavy a build as Neanderthals - they didn't need it.

Although Neanderthals must have had very high levels of within-group cooperation, they were no angels: they had a weakness for long pork. As we said before, they may have experienced evolutionary pressures favoring clannishness or even hostility to outsiders. That's natural: reduced competition at one level allows more competition at a higher level. If the members of some ethny could 'all just get along', they could conquer the world, and likely would. We have found clear-cut evidence of cannibalism at several Neanderthal sites. At Krapina, every long Neanderthal bone found had been split open for marrow.

Like other early humans, Neanderthals were relatively uncreative; their tools changed very slowly and they show no signs of art, symbolism, or trade. Their brains were large and had grown larger over time, in parallel with humans in Africa, but we really have no idea what they did with them. Since brains are metabolically expensive, natural selection wouldn't have favored an increase in brain size unless it increased fitness, but we don't know what function that those big brains served. Usually people explain that those big brains are not as impressive as they seem, since the brain-to-body weight ratio is what’s really important, and Neanderthals were heavier than modern humans of the same height.

You may wonder why we normalize brain size by body weight. We wonder as well.

Among less intelligent creatures, such as amphibians and reptiles, most of the brain is busy dealing with a flood of sensory data. You’d expect that brain size would have to increase with body size in some way in order to keep up. If you assume that the key is how much surface the animal has, in order to monitor what’s causing that nagging itch and control all the muscles needed for movement, brain size should scale as the 2/3rds power of weight. If an animal has a brain that’s bigger than predicted by that 2/3rds power scaling law, then maybe it’s smarter than average. That argument works reasonable well for a wide range of species, but it can’t make sense for animals with big brains. In particular it can’t make sense for primates, since in that case we know that most of the brain is used for purposes other than muscle control and immediate reaction to sensation. Look at this way - if dividing brain volume by weight is a valid approach, Nero Wolfe must be really, really stupid.

We think that Neanderthal brains really were large, definitely larger than those of people today. This doesn’t necessarily mean that they were smarter, at least not as a culture. The archaeological record certainly indicates that they were not, since their material culture was definitely simpler than that of their successors. In fact, they may have been relatively unintelligent, even with their big brains. Although brain size certainly is correlated with intelligence in modern humans, it is not the only factor that affects intelligence. By the way, you may have read somewhere (The Mismeasure of Man) that brain volume has no relationship to intelligence, but that’s just a lie.

One paradoxical possibility is that Neanderthals lacked complex language and so had to be smart as individuals in order to learn their culture and technology, while that same lack severely limited their societal achievements. Complex language of the type we see in modern humans makes learning a lot easier: without it, learning to create even Mousterian tools may have been difficult. In that case, individuals would have to repeatedly re-invent the wheel (so to speak) while there would have been little societal progress.

It could also be that Neanderthal brains were less powerful than you’d expect because there just weren’t enough Neanderthals. That may sound obscure, but bear with us. The problem is that evolution is less efficient in small populations, in the same way that any statistical survey – polls, for example -becomes less accurate with fewer samples. Natural selection is pretty good at eliminating a defective gene when its disadvantage is significantly great than the inverse of the population size. When the disadvantage is smaller than that, the defective gene has a reasonable probability of reaching high frequency by drift. It can even become universal in that population. This tendency is insignificant in large populations, but it can lead to problems in small ones, as more and more slightly deleterious mutations accumulate. There is a countervailing tendency – the generation of favorable mutations, which are likely to spread – but that tendency becomes weaker and weaker as the population becomes smaller. Thus, over the long term, a population that is too small is likely to go extinct for purely genetic reasons, if some other disaster doesn’t strike first. This is an issue that concerns conservationists who are trying to maintain endangered species such as the whooping crane or Florida panther.

Neanderthals were not so rare as to risk extinction by genetic load. But the same argument has other implications. Even if a population is big enough for long-term survival, it may still suffer some genetic load. This would matter most for extremely complicated adaptations that relied on precise action of many genes: the more complicated the adaptation, the more vulnerable it would be to this kind of genetic sand in the gears. As it happens, the most complicated human adaptation is the brain, and one might expect that it would show the greatest vulnerability to such problems. There is some direct evidence of this, concerning a different kind of mutation load. Children whose parents are closely related, first cousins or closer, are significantly more likely to have two copies of deleterious recessive mutations – and their IQ is affected to a greater extent that other traits such as height. We think that the long-term effective population size of Neanderthals was less than that of anatomically modern humans, since Africa was less affected by the ice ages, which at their worst made most of Europe uninhabitable – so Neanderthals may have had more problems with genetic load. Because of this, Neanderthals may have had less efficient brains than their anatomically modern contemporaries or humans today.

Our favorite hypothesis is that Neanderthals and other archaic humans had a fundamentally different kind of learning than moderns. One of the enduring puzzles is the near-stasis of tool kits in early humans - as we have said before, the Acheulean hand-axe tradition last for almost a million years and extended from the Cape of Good Hope to Germany, while the Mousterian lasted for a quarter of a million years. Somehow these early humans were capable of transmitting a simple material culture for hundreds of thousands of years with little change. More information was transmitted to the next generation than in chimpanzees, but not as much as in modern humans. At the same time, that information was transmitted with surprisingly high accuracy. This must be the case, since random errors in transmission would have caused changes in those tool traditions, resulting in noticeable variation over space and time – which we do not see.

It looks to us as if toolmaking in those populations was, to some extent, innate: genetically determined. Just as song birds are born with a rough genetic template that constrains what songs are learned, early humans may have been born with genetically determined behavioral tendencies that resulted in certain kinds of tools. Genetic transmission of that information has the characteristics required to explain this pattern of simple, near-static technology, since only a limited amount of information can be acquired through natural selection, while the information that is acquired is transmitted with very high accuracy.

27 comments:

So the Neanderthals had large noses, pushed-forward faces, were probably furry and clannish, and their area of habitation included the Middle East? Oh, my.

A fascinating piece. None of its explanations for the paradox of them having large brains but primitive material culture sounded very plausible to me, but I'm not an expert, so I could be wrong about that.

The more-or-less official story now is that the Neanderthals went extinct because they couldn't compete with (and/or were killed off by) newcomers from Africa about 30,000 years ago. Modern Caucasoids (of which I'm one) are supposed to have descended from those newcomers. Some people dispute this theory, saying that modern Caucasoids descend from an ancient mixture of Neanderthals and out-of-Africa invaders.

The forces of political correctness are firmly on the side of the first theory because it implies that the genetic distance between modern races is smaller than does the second one. Not being an expert I have no idea who's right. I'm not ruling out that the PC folks could be unintentionally right - even a broken clock is correct twice a day.

If these Neanderthals were like cannibalistic lions on two legs, and they were constantly killing each other and fighting the largest and most dangerous mammals ever with short stabbing spears, there must have been a fine line between life and death.

An introduced disease to just make half the members of a Neanderthal clan sick with the flu could mean starvation to the weakened clan, if not the death of whole clans outright from disease. With such small isolated populations, new diseases would be apocolyptic. Increased competition from humans could reduce the meat supply just enough to mean starvation to clans needing a constant influx of fresh meat, perhaps 8-10,000 calories a day of it per Neandertal member.

I'm only about halfway through this so far but I want to make sure that I thank you for this. It's absolutely amazing. There's nothing quite like reading material on the subject of evolutionary survival of the fittest to properly align one's thoughts with the world as it likely is.

We humans are still...humans. We're but a species of animal out there are we exhibit the social, moral and emotional tendencies that evolution has granted us. It's while (and hopefully after) reading material such as this though that we're granted easy access to seeing ourselves (and humanity in general) from the outside. Be we winners or losers in the world within which we live (and as creatures that imagine ourselves to be more than mortal we are all eventually losers) this sort of material (written by sufficiently authoritative and self-doubting folk such that we needn't constantly be concerned with it being but a collection of just-so stories) offers us a god's eye view of ourselves and a realignment of our moral, social and emotional perceptions. It's beautiful. Steve, thank you.

It looks to us as if toolmaking in those populations was, to some extent, innate: genetically determined. Just as song birds are born with a rough genetic template that constrains what songs are learned, early humans may have been born with genetically determined behavioral tendencies that resulted in certain kinds of tools. Genetic transmission of that information has the characteristics required to explain this pattern of simple, near-static technology, since only a limited amount of information can be acquired through natural selection, while the information that is acquired is transmitted with very high accuracy.

The more-or-less official story now is that the Neanderthals went extinct because they couldn't compete with (and/or were killed off by) newcomers from Africa about 30,000 years ago. Modern Caucasoids (of which I'm one) are supposed to have descended from those newcomers. Some people dispute this theory, saying that modern Caucasoids descend from an ancient mixture of Neanderthals and out-of-Africa invaders.

Supposedly, genetic testing to date shows no gene flow from neanderthals to modern living humans, which supports the official story.

I believe John Hawks claims known human and primate behavior makes some amount of gene flow almost certain, or at least the default supposition. Possibly we just haven't found or recognized it yet. Or possibly there was some gene flow but the neanderthal genes all got swept out in selection without reaching fixation. A complication of genetic testing is that environmental contamination of samples with human DNA from excavation and handling seems nearly universal, so screening for contamination may be throwing out some positive matches.

An introduced disease to just make half the members of a Neanderthal clan sick with the flu could mean starvation to the weakened clan, if not the death of whole clans outright from disease. With such small isolated populations, new diseases would be apocolyptic.

The incoming anatomically modern humans were neither agriculturists nor city-dwellers, which removes a large driver of disease innovation. The Europeans in America model is possible, but there's no particular evidence to think it likely.

Don't look for this book in American education factories. The story of the Neanderthals is so un-PC. Getting wiped out by a flood of African immigrants might cause shoolchildren to start asking questions.

By the way, you may have read somewhere (The Mismeasure of Man) that brain volume has no relationship to intelligence, but that’s just a lie.

Mismeasure author Stephen Jay Gould is the one of the greatest liars of history. His fraudulent intellectualism eroded the very foundation of America and planted the seeds of our destruction as a cohesive nation.

We will never recover from the destruction (through mass low IQ immigration and mass alien immigration) of our once-unbeatable demography and culture. To turn a white nation into a brown nation is to put it asleep, to force it to sit on the sidelines of history as a backwater a la Latin America. Spain and Portugal were transmogrified by Moorish blood. They were genetically cut off from the rest of Europe much like present day Turkey.

The Mismeasure of Man was just one attack of thousands. Death by a thousand cuts is what has taken place. Books like the Mismeasure of Man provided the "intellectual" basis for suicidal mass immigration and suicidal tolerance of alien peoples.

The technique is called Culture Cracking: thousands of widely disseminated poisonous "intellectual" attacks can shatter an entire civilization.

Lets see, if our ancestors killed off the Neanderthals then I should be able to use that to prove my own moral superiority. I feel more guilty about killing Neanderthals than you do, so I'm morally superior. Yeah, that should work.

If only we could find a few living Neanderthals, this could be the start of a whole new rights movement. We could even demand that all modern Caucasoids leave Europe, in order to return the continent to its indigenous inhabitants. This could be big.

Some people dispute this theory, saying that modern Caucasoids descend from an ancient mixture of Neanderthals and out-of-Africa invaders.

Cochran and Harpending's description of Neanderthal's makes this sound extremely unlikely. To our ancestors, Neanderthals would have been vicious scary hairy monsters, not something you want to breed with. A human would be as likely to breed with a bear as a Neanderthal. And if Neanderthals ate their own kind, you can be damn sure they probably viewed early humans as quite tasty. I've always wondered if Scandinavian legends of trolls might not be based on folk memories of Neanderthals - the latest research seems to make that idea oddly plausible.

Those neanderthals were primitive beasts! We (the god-like humans) tried to get the neanderthals to recycle, eat vegetarian, embrace sustainable lifestyles and practice non-discrimination. But they refused, so they went extinct.

All humor aside, there was the study a few years back that hypothesized that one advantage H. sapiens had over H. neanderthalensis is that our ancestors developed labor specialization between the sexes.

Yep, that's right - barefoot and pregnant is what kept us alive. Now whoever would've guessed that after looking at the fertility gap between traditional populations like Mormons, Muslims, Mexicans, and Hasidic Jews and the ones which celebrate feminisim?

Loved the troll comment, but your breeding comment assumes the mating was voluntary, and was between female Neanderthals and male humans. Of course the human female and her clan could've (would've) discarded the offspring if it looked anything like the father...

If only we could find a few living Neanderthals, this could be the start of a whole new rights movement. We could even demand that all modern Caucasoids leave Europe, in order to return the continent to its indigenous inhabitants. This could be big.

The forces of political correctness are firmly on the side of the first theory because it implies that the genetic distance between modern races is smaller than does the second one.

Keep in mind that the developing science of deep ancestry postulates that the earliest and deepest split in the Homo sapiens line is between the ancestors of black Africans and the ancestors of everyone else. That's fairly un-PC. It also breaks off Australian aborigines quite soon after the African exodus.

There's plenty of PC in it, though. One only has to read Spencer Wells to see how PC it gets, with his references to how closely we all are supposedly related. In The Seven Daughters of Eve, Bryan Sykes speaks of our early ancestors almost as if they were pacifists. In his book the early humans of Europe never come to blows with each other, even though well over one-third of all remains are discovered to have died from violence.

Nicholas Wade, on the other hand, is quite blunt when he comes out and acknowledges that our hunter-gatherer ancestors were not Quakers, and he actually calls scientists to task for their obfuscation.

The other highly relevant and un-PC aspect to deep ancestry is this: modern black Africans are known to be the most genetically diverse group in the world, the result of the fact that non-Africans are descended only from a very small splinter group of the African population 50,000 years ago. But how has all this genetic "diversity" served Africa politically, economically, or intellectually? Turkey, too, is far more genetically diverse than Germany, Britain, or Japan yet Turkey lags.

If what we actually see with our eyes isn't enough to kill the "Celebrate Diversity" myth, deep ancestry drives the knife even deeper.

1) The myth that hunter-gatherers, either modern groups or our early ancestors, are/were pacifistic noble savages.

2) The myth that vast amounts of genetic diversity is necessarily good for a society. Turkey and black Africa, both genetically very diverse, are far less peaceful and prosperous than the more homogeneous nations of Europe and Asia.

3) The deep, ancient split between black Africans and everyone else.

4) The myth of climate stasis. One can't read a book on deep ancestry without being reminded that our climate is not static, and has been changing since long before humans had any power to affect it.

This seems as good a post as any for a long-time question of mine: why are so damn many people of Anglo-European descent nearsighted?

It's got to be really recent, because I imagine being a squinty-eyed nerd when the neighboring tribe decided to lay an ambush or trying to get a good site picture on that red deer would be pretty brutal. For that matter, how could your line make it out of the Middle Ages without good vision?

"One paradoxical possibility is that Neanderthals lacked complex language and so had to be smart as individuals in order to learn their culture and technology, while that same lack severely limited their societal achievements."

"Don't look for this book in American education factories. The story of the Neanderthals is so un-PC. Getting wiped out by a flood of African immigrants might cause shoolchildren to start asking questions."

Einstein, the 'African immigrant' was your forefather.

"It also breaks off Australian aborigines quite soon after the African exodus."

"2) The myth that vast amounts of genetic diversity is necessarily good for a society. Turkey and black Africa, both genetically very diverse, are far less peaceful and prosperous than the more homogeneous nations of Europe and Asia."

Well, New York City is more genetically diverse than Wausau isn't it? It all depends on how you look at it.

Somehow these early humans were capable of transmitting a simple material culture for hundreds of thousands of years with little change.

If you're collectively living on a razor's edge, who's going to let some youngster play with the tried and true method for getting something done? To experiment, failure has to be considered an acceptable option. "Hail Mary" saves via desperate experimentation occur but are not likely and definitely not reliable.

Myopia is not "eye strain." It is a hereditary condition that manifests in an elongated eyeball. This means the lens will focus light at a point in front of your optic receptors instead of in the sweet spot for vision in the back of the eyeball.

Now, I'm not a hunter-gatherer, but I have to believe myopia would send you right off the Lamarckean rails in short order. But in modern society, I'd bet half of all Anglo-Europeans are myopic. Where did this come from and when? I wouldn't think myopic people would have made it out of the Middle Ages even.

Reading is probably the major culprit. Diet may play a role as well. Follow your own reasoning: Genetic change can't possibly account for the recent explosion of myopia. As for heritability of eyesight: Recall that personality and IQ (and thus e.g. reading vs. outdoor activity preference) are heritable (perhaps so is the response of the eye to a given stimulus).

"One paradoxical possibility is that Neanderthals lacked complex language and so had to be smart as individuals in order to learn their culture and technology, while that same lack severely limited their societal achievements."

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